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<html>
<head>
<title>Javascript Brainfuck Interpreter / Debugger</title>
<script language="Javascript" src="arrays.js"></script>
<script>
// interactive input mode:
//
// a ascii char
// #97 decimal char index
// !141 octal char index
// $61 hex char index
var g_debugging = 0;
var g_memory = Array();
var g_max_mem = 255;
var g_max_val = 255;
var g_ip = 0;
var g_mp = 0;
var g_dp = 0;
var g_program = new Array();
var g_targets = new Array();
var g_input = new Array();
var g_output = '';
var g_viewer_width = 63;
var g_quit_debug_run = 0;
var g_debugging_running = 0;
var g_prompt_for_input = 0;
var g_running = 0;
var g_linebreaker = "\n";
function init(){
if (navigator.userAgent.toLowerCase().indexOf("msie") != -1){
g_linebreaker = "\r";
}
document.getElementById('edit_source').value = "++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.";
debug_toggle(document.getElementById('mainform'));
}
function init_memory(){
for(var i=0; i<=g_max_mem; i++){
g_memory[i] = 0;
}
g_mp = 0;
}
function init_io(){
g_dp = 0;
g_output = '';
}
function init_prog(code){
g_program.length = 0;
for(var i=0; i<code.length; i++){
var op = code.charAt(i)
// check it's not a carriage return or anything that will
// break the program viewer too badly :)
if (is_valid_op(op)){
g_program[g_program.length] = op;
}
}
g_ip = 0;
init_targets();
}
function init_targets(){
g_targets.length = 0;
var temp_stack = new Array();
for(var i=0; i<g_program.length; i++){
var op = g_program[i];
if (op == '['){
temp_stack.push(i);
}
if (op == ']'){
if (temp_stack.length == 0) alert('Parseing error: ] with no matching [');
var target = temp_stack.pop();
g_targets[i] = target;
g_targets[target] = i;
}
}
if (temp_stack.length > 0) alert('Parseing error: [ with no matching ]');
}
function init_input(){
g_prompt_for_input = document.getElementById('input_mode_1').checked;
g_input.length = 0;
var in_data = document.getElementById('edit_input').value;
for(var i=0; i<in_data.length; i++){
g_input[g_input.length] = in_data.charAt(i);
}
g_dp = 0;
}
function get_input(){
if (g_prompt_for_input){
var data = window.prompt("Enter an input character (use #xxx to specify a decimal code, !xxx for an octal code, or $xxx for a hex code):", "#0");
if ((data == null) || (!data)) return 0;
if (data.charAt(0) == '#'){
return parseInt(data.substr(1), 10);
}
if (data.charAt(0) == '!'){
return eval('0'+data.substr(1));
}
if (data.charAt(0) == '$'){
return eval('0x'+data.substr(1));
}
return data.charCodeAt(0);
}else{
var result = (g_dp >= g_input.length)?0:g_input[g_dp].charCodeAt(0);
g_dp++;
return result;
}
}
function is_valid_op(op){
if (op == '+') return 1;
if (op == '-') return 1;
if (op == '>') return 1;
if (op == '<') return 1;
if (op == '[') return 1;
if (op == ']') return 1;
if (op == '.') return 1;
if (op == ',') return 1;
if (op == '#') return 1;
return 0;
}
function put_output(c){
g_output += c;
}
function execute_opcode(op){
switch(op){
case '+':
g_memory[g_mp]++;
if (g_memory[g_mp] > g_max_val) g_memory[g_mp] = 0;
break;
case '-':
g_memory[g_mp]--;
if (g_memory[g_mp] < 0) g_memory[g_mp] = g_max_val;
break;
case '>':
g_mp++;
if (g_mp > g_max_mem) g_mp = 0;
break;
case '<':
g_mp--;
if (g_mp < 0) g_mp = g_max_mem;
break;
case '[':
if (g_memory[g_mp] == 0) g_ip = g_targets[g_ip];
break;
case ']':
g_ip = g_targets[g_ip] - 1;
break;
case '.':
put_output(String.fromCharCode(g_memory[g_mp]));
break;
case ',':
g_memory[g_mp] = get_input();
break;
}
}
function bf_interpret(prog, input){
if (g_running){
bf_stop_run();
return;
}
g_running = 1;
init_prog(prog);
init_memory();
init_io();
init_input();
disable_text_box('edit_source');
disable_text_box('edit_input');
disable_text_box('edit_output');
disable_text_box('edit_progs');
disable_button('input_mode_1');
disable_button('input_mode_2');
disable_button('button_debug');
change_button_caption('button_run', 'Stop');
bf_run_step();
}
function bf_stop_run(){
enable_text_box('edit_source');
enable_text_box('edit_input');
enable_text_box('edit_output');
enable_text_box('edit_progs');
enable_button('input_mode_1');
enable_button('input_mode_2');
enable_button('button_debug');
change_button_caption('button_run', 'Run');
sync_input();
g_running = 0;
}
function bf_run_done(){
bf_stop_run();
document.getElementById('edit_output').value = g_output;
}
function bf_run_step(){
// execute instrcution under ip
var op = g_program[g_ip];
execute_opcode(op);
// increment ip
g_ip++;
if (g_ip >= g_program.length){
bf_run_done();
return;
}
window.setTimeout('bf_run_step();', 0);
}
function update_memview(){
var lines = [];
for (var y=0; y<16; y++){
var cells = [];
for (var x=0; x<16; x++){
var idx = x + (y * 16);
var label = pad_num(g_memory[idx], 3);
if (idx == g_mp){
cells.push('<span style="background-color: lightgreen">'+label+'</span>');
}else{
cells.push(label);
}
}
lines.push(cells.join(' '));
}
var html = lines.join(g_linebreaker);
var p_node = document.getElementById('memview');
p_node.innerHTML = html;
return;
var mem_slots = Math.floor(g_viewer_width / 4);
var pre_slots = Math.floor(mem_slots / 2);
var low_slot = g_mp - pre_slots;
if (low_slot < 0) low_slot += g_max_mem;
var line_1 = '';
for(var i=0; i<mem_slots; i++){
var slot = low_slot + i;
if (slot >= g_max_mem) slot -= g_max_mem;
var label = pad_num(g_memory[slot], 3);
if (i==0){
line_1 += '<u>'+label+'</u> ';
}else{
line_1 += label + ' ';
}
}
var line_2 = '';
for(var i=0; i<pre_slots; i++){
line_2 += ' ';
}
line_2 += '^';
var line_3 = '';
for(var i=0; i<pre_slots; i++){
line_3 += ' ';
}
line_3 += 'mp='+g_mp;
var line_4 = '';
for(var i=0; i<mem_slots; i++){
var slot = low_slot + i;
if (slot >= g_max_mem) slot -= g_max_mem;
var label = pad_num(slot, 3);
line_4 += label + ' ';
}
//set_viewdata('memview', line_1 + g_linebreaker + line_2 + g_linebreaker + line_3 + g_linebreaker + line_4);
var p_node = document.getElementById('memview');
p_node.innerHTML = line_1 + g_linebreaker + line_2 + g_linebreaker + line_3 + g_linebreaker + line_4;
}
function pad_num(a, b){
var c = new String(a);
for(var i=c.length; i<b; i++) c = '0'+c;
return c;
}
function update_progview(){
var pre_slots = Math.floor(g_viewer_width / 2);
var low_slot = g_ip - pre_slots;
var line_1 = '';
for(var i=0; i<g_viewer_width; i++){
var slot = low_slot + i;
if ((slot >= 0) && (slot < g_program.length)){
line_1 += g_program[slot];
}else{
line_1 += '_';
}
}
var line_2 = '';
for(var i=0; i<pre_slots; i++){
line_2 += ' ';
}
line_2 += '^';
var line_3 = '';
for(var i=0; i<pre_slots; i++){
line_3 += ' ';
}
line_3 += 'ip='+g_ip;
set_viewdata('progview', line_1 + g_linebreaker + line_2 + g_linebreaker + line_3);
}
function update_inputview(){
if (g_prompt_for_input){
set_viewdata('inputview', "-input prompt mode-");
}else{
var line_1 = g_input.join('');
var line_2 = '';
for (var i=0; i<g_dp; i++) line_2 += ' ';
line_2 += '^';
set_viewdata('inputview', line_1 + g_linebreaker + line_2);
}
}
function update_outputview(){
var line_1 = g_output;
var line_2 = '';
for (var i=0; i<g_output.length; i++) line_2 += ' ';
line_2 += '^';
set_viewdata('outputview', line_1 + g_linebreaker + line_2);
}
function set_viewdata(view, data){
var new_node = document.createTextNode(data);
var p_node = document.getElementById(view);
p_node.replaceChild(new_node, p_node.childNodes[0]);
}
function run(f){
bf_interpret(f.source.value, f.input.value);
}
function debug_done(){
disable_button('button_step');
disable_button('button_run_debug');
}
function debug_toggle(f){
if (g_debugging == 1){
g_debugging = 0;
enable_text_box('edit_source');
enable_text_box('edit_input');
enable_text_box('edit_output');
enable_text_box('edit_progs');
enable_button('button_run');
enable_button('input_mode_1');
enable_button('input_mode_2');
change_button_caption('button_debug', 'Start Debugger');
disable_button('button_step');
disable_button('button_run_debug');
set_viewdata('progview', ' ');
set_viewdata('memview', ' ');
set_viewdata('inputview', ' ');
set_viewdata('outputview', ' ');
sync_input();
}else{
g_debugging = 1;
disable_text_box('edit_source');
disable_text_box('edit_input');
disable_text_box('edit_output');
disable_text_box('edit_progs');
disable_button('button_run');
disable_button('input_mode_1');
disable_button('input_mode_2');
change_button_caption('button_debug', 'Quit Debugger');
enable_button('button_step');
enable_button('button_run_debug');
start_debugger();
}
}
function start_debugger(){
init_memory();
init_io();
init_prog(document.getElementById('edit_source').value);
init_input();
update_memview();
update_progview();
update_inputview();
update_outputview();
}
function run_step(){
var op = g_program[g_ip];
execute_opcode(op);
g_ip++;
update_memview();
update_progview();
update_inputview();
update_outputview();
if (g_ip >= g_program.length){
debug_done();
//alert("done!");
}
}
function start_debug_run(){
disable_button('button_debug');
disable_button('button_step');
change_button_caption('button_run_debug', 'Stop Running');
g_debugging_running = 1;
}
function stop_debug_run(){
enable_button('button_debug');
enable_button('button_step');
change_button_caption('button_run_debug', 'Run To Breakpoint');
g_debugging_running = 0;
}
function run_debug(){
if (g_debugging_running){
g_quit_debug_run = 1;
}else{
start_debug_run();
g_quit_debug_run = 0;
run_debug_step();
}
}
function run_debug_step(){
run_step();
if ((g_program[g_ip] == '#') || g_quit_debug_run || (g_ip >= g_program.length)){
stop_debug_run();
if (g_ip >= g_program.length){
debug_done();
}
return;
}
window.setTimeout('run_debug_step();', 0);
}
function disable_text_box(name){
var elm = document.getElementById(name);
elm.disabled = true;
elm.style.backgroundColor = '#cccccc';
}
function enable_text_box(name){
var elm = document.getElementById(name);
elm.disabled = false;
elm.style.backgroundColor = '';
}
function disable_button(name){
var elm = document.getElementById(name);
elm.disabled = true;
}
function enable_button(name){
var elm = document.getElementById(name);
elm.disabled = false;
}
function change_button_caption(name, caption){
var elm = document.getElementById(name);
elm.value = caption;
}
function sync_input(){
if (document.getElementById('input_mode_1').checked){
disable_text_box('edit_input');
}else{
enable_text_box('edit_input');
}
}
</script>
<style>
body {
margin: 0px;
background-color: #eeeeee;
color: #000000;
font-family: Arial, Helvetica, Sans-serif;
}
textarea.editsmall {
width: 400px;
height: 100px;
}
textarea.edit {
width: 400px;
height: 200px;
}
div.main {
padding: 6px;
border: 1px solid #000000;
background-color: #dddddd;
}
pre.viewer {
width: 510px;
padding: 6px;
border: 1px solid #000000;
background-color: #dddddd;
margin: 0px;
}
p.viewer {
width: 510px;
padding: 6px;
border: 1px solid #000000;
background-color: #dddddd;
margin: 0px;
font-family: monospace;
white-space: pre;
}
</style>
</head>
<body onload="init();">
<!-- NAV -->
<div id="page">
<form name="mainform" id="mainform">
<table cellspacing="20" cellpadding="0" border="0" align="center">
<tr valign="top">
<td colspan="2">
<h1>Javascript Brainfuck Interpreter / Debugger</h1>
<b>By <a href="http://www.iamcal.com/">Cal Henderson</a></b><br>
<hr>
</td>
</tr>
<tr valign="top">
<td>
Program:<br>
<select onchange="this.form.source.value=this.options[this.selectedIndex].value; this.selectedIndex=0;" id="edit_progs">
<option value="">Example programs...</option>
<option value="++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.">Hello World</option>
<option value=",[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>++++++++++++++<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>>+++++[<----->-]<<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>++++++++++++++<-[>+<-[>+<-[>+<-[>+<-[>+<-[>++++++++++++++<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>>+++++[<----->-]<<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>++++++++++++++<-[>+<-]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]>.[-]<,]">Rot 13 (slow!)</option>
<option value="+++++++++++>+>>>>++++++++++++++++++++++++++++++++++++++++++++>++++++++++++++++++++++++++++++++<<<<<<[>[>>>>>>+>+<<<<<<<-]>>>>>>>[<<<<<<<+>>>>>>>-]<[>++++++++++[-<-[>>+>+<<<-]>>>[<<<+>>>-]+<[>[-]<[-]]>[<<[>>>+<<<-]>>[-]]<<]>>>[>>+>+<<<-]>>>[<<<+>>>-]+<[>[-]<[-]]>[<<+>>[-]]<<<<<<<]>>>>>[++++++++++++++++++++++++++++++++++++++++++++++++.[-]]++++++++++<[->-<]>++++++++++++++++++++++++++++++++++++++++++++++++.[-]<<<<<<<<<<<<[>>>+>+<<<<-]>>>>[<<<<+>>>>-]<-[>>.>.<<<[-]]<<[>>+>+<<<-]>>>[<<<+>>>-]<<[<+>-]>[<+>-]<<<-]">Fibonacci Numbers</option>
<option value="++++++++++++++++++++#++++++++++++++++++++#++++++++++++++++++++#++++++++++++++++++++#++++++++++++++++++++#-.--.+++++++++++.">Breakpoints Demo</option>
</select><br>
<textarea id="edit_source" name="source" wrap="virtual" class="edit"></textarea><br>
<br>
Input:<br>
<input type="radio" id="input_mode_1" name="input_mode" value="1" onclick="sync_input();"> Prompt for input as needed<br>
<input type="radio" id="input_mode_2" name="input_mode" value="2" onclick="sync_input();" checked> Pre-supply input:<br>
<textarea id="edit_input" name="input" wrap="virtual" class="editsmall"></textarea><br>
<br>
Output:<br>
<textarea id="edit_output" name="output" wrap="virtual" class="editsmall"></textarea><br>
<br>
</td>
<td>
<br>
<input type="button" value="Run" onclick="run(this.form);" id="button_run">
<input type="button" value="Start Debugger" onclick="debug_toggle(this.form);" id="button_debug">
<input type="button" value="Single Step" onclick="run_step();" disabled id="button_step">
<input type="button" value="Run To Breakpoint" onclick="run_debug();" disabled id="button_run_debug">
<br>
<br>
Source Viewer:<br>
<pre class="viewer" id="progview"> </pre>
<br>
Memory Viewer:<br>
<p class="viewer" id="memview"> </p>
<br>
Input Viewer:<br>
<pre class="viewer" id="inputview"> </pre>
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Output Viewer:<br>
<pre class="viewer" id="outputview"> </pre>
<br>
<b>Note:</b> The hash ("#") character marks a breakpoint.
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Example programs taken from <a href="http://esoteric.sange.fi/brainfuck/">the Brainfuck Archive</a>
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